Those things have been available as reproductions for at least the last 30 years.The MG brand mats even look new.
I was speaking more to technology. 1966 tech is a bit different from, say 1972 tech. Brakes, electrical systems, safety standards, etc. They made MGB's through 1980 with very little change in appearance. They didn't even put the ugly rubber bumpers on them until somewhere around 1975.Looks wise is another biggie for this car. If you're gonna sink your time and money and effort, this is a good classic to go with. I think Loren asked if 1966 mattered, and yea totally matters I have to say it's like curb appeal with a house.